const regex = /^(.+order_by=).+?(&|$)(.*)$/gm;
// Alternative syntax using RegExp constructor
// const regex = new RegExp('^(.+order_by=).+?(&|$)(.*)$', 'gm')
const str = `http://www.stackoverflow.com?a=1&b=2
http://www.stackoverflow.com?a=2&b=3&order_by=old_data
http://www.stackoverflow.com?a=2&b=3&order_by=old_data&c=4
http://www.stackoverflow.com?order_by=old_data&a=2&b=3
http://www.stackoverflow.com
\$1new_sort\$2\$3`;
// Reset `lastIndex` if this regex is defined globally
// regex.lastIndex = 0;
let m;
while ((m = regex.exec(str)) !== null) {
// This is necessary to avoid infinite loops with zero-width matches
if (m.index === regex.lastIndex) {
regex.lastIndex++;
}
// The result can be accessed through the `m`-variable.
m.forEach((match, groupIndex) => {
console.log(`Found match, group ${groupIndex}: ${match}`);
});
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for JavaScript, please visit: https://developer.mozilla.org/en/docs/Web/JavaScript/Guide/Regular_Expressions